Lions are treating drug use allegations 'very seriously', Voss says

BRISBANE Lions coach Michael Voss admits he cannot guarantee allegations of drug use levelled at his former teammates are untrue, but says his club is trying to distinguish between "what's fact and fiction".

The Lions have denied the claims and say they had no reason to believe McGrath's word.

The AFL says McGrath's allegations are unsubstantiated and that no investigation "will be undertaken in the absence of credible information or evidence".

Voss, who led Brisbane to its 2001-03 hat-trick of premierships, played until 2006 and then coached the club from 2009, conceded he could not definitively say his former teammates weren't using drugs.

"I can't be naive enough to sit here and say that it hasn't happened. I couldn't say that with 100 per cent certainty," Voss told Brisbane's Triple M on Tuesday.

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"But there's been a whole bunch of things that have been mentioned and I would really question the validity of those allegations. That's why we say they're unsubstantiated. The names that are being thrown around, I haven't even seen before. Or met (those people)."

Voss said he could not recall meeting Jason McGrath, and that some of his former teammates could not recall meeting him. Ash McGrath, who played in Brisbane's 2003 premiership win, is still on the Lions playing list.

Voss said there were inconsistencies in Jason McGrath's allegations and that Brisbane found that "trying to sort through what's fact and fiction is just a little bit hard at present".

But he said the club treated the claims "very seriously" and said anyone with information should contact authorities.

"It refers to a previous era at the club and the club has got to treat that very seriously, if there is anything there," he said.